Algebra 2 Course Intro / Reviewmrdealy.weebly.com/uploads/2/3/5/2/23520438/hrw... · 9/1/2015 ·...
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Algebra 2 Course Intro / Review
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Textbook Intro
• Units, Modules, Lessons• Glossary• Back page formulas• Selected answers
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Transformations
Translation: shifts the graph of a function up, down, right, or left.
If a and b are numbers greater than 0, then do the following:
Translation Effect on coordinates
Right a units (x, y) ‐‐> ( ______, _______)
Left a units (x, y) ‐‐> ( ______, _______)
Up b units (x, y) ‐‐> ( ______, _______)
Down b units (x, y) ‐‐> ( ______, _______)
ex. A line has the points (‐4, 0), (0, ‐2), and (2, ‐3).
Find the points after a translation of 1 unit up and 2 units to the right.
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Reflection: reflects the graph of a function across the x‐axis or
y‐axis.
If a and b are numbers greater than 0, then do the following:
Reflection Effect on coordinates
Across the x‐axis (x, y) ‐‐> ( ______, _______)
Across the x‐axis (x, y) ‐‐> ( ______, _______)
A line has the points (‐2, ‐1), (‐4, 2), and (1,3). Find the points after a reflection across the x‐axis.
Finding Slope:
Slope = riserun
ΔyΔx
y1 - y2
x1 - x2= =
ex. (0, 8) (-1, -5) ex. (7, 3) (-2, 3)
ex. (-6, 11) (5, -2) ex. (7, -3) (7, 8)
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Find EQ from a Graph
.
. (3, 6)
(-2, -4)
Horizontal / Vertical Lines:
Horizontal: Slope = _______
Vertical: Slope = _______
y = 3
x = 3
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Find the Linear EQ:
ex. m = 4 thru (4, 3)
ex. thru (-4, -5) and (4, -1)
ex. thru (-1, -4) and (-2, 5)
ex. thru (-1, 3) and (3, -1)
Intercepts:
y-intercept: The value of y at the point where a line or graph intersects the y-axis.
The value of x is zero at this point.
x-intercept: The value of x at the point where a line or graph intersects the x-axis.
The value of y is zero at this point.
ex. y = 2x - 3 ex. x + 3y = 12Find the x and y intercepts:
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HW: Review wkst